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Employee Benefit Plans, Accumulated Post-Retirement Benefit Obligation, Funded Status, and Net Periodic Benefit Cost (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Change in Benefit Obligations [Roll Forward]            
Benefit obligation at beginning of year $ 1,967 $ 1,928 $ 1,479      
Interest cost 81 80 71      
Benefits paid (109) (102) (100)      
Actuarial (gain) loss       $ (69) $ 61 $ 478
Benefit obligation at end of period 1,870 1,967 1,928      
Funded Status of Plan [Abstract]            
Benefit obligation at end of period (1,967) (1,928) (1,479) (1,870) (1,967) (1,928)
Unamortized loss       156 240 192
Accrued benefit cost       $ (1,714) $ (1,727) $ (1,736)
Weighted average discount rate as of December 31       0.0425 0.0425 0.0425
Components of Net Periodic Benefit Cost [Abstract]            
Interest cost 81 80 71      
Amortization of (gain) loss 4 0 (12)      
Other settlement expense 11 12 10      
Net periodic benefit cost $ 96 $ 92 $ 69      
Weighted average discount rate for net periodic cost       0.0425 0.0425 0.0500